Davis Dam Zequanox TM Treatments

Zequanox TM

• NY State Museum developed environmentally friendly bacterial product lethal only to quagga and zebra mussels• Made from dead cells of a specific strain of Pseudomonas flourescens (CL 145A)• Commercially developed by Marrone Bio Innovations • Reclamation and MBI have a cooperative research and development agreement (CRADA)

Pseudomonas flourescens

Zequanox TM

Natural compounds in the bacterial product kill the invasive mussels when ingested by destroying the mussels’ digestive system.

Photos by New York State Museum

Healthy gut Treated gut

Ecotoxicology Studies ZequanoxTM tested safe on numerous important aquatic species:

• Water flea, Daphnia magna• Freshwater shrimp, Hyalella azteca• Native blue mussel, Mytilus edulis• Native freshwater (Unionid) clams – (Elliptio complanata,

Lampsilis radiate, Lasmigona compressa, Pyganodon grandis, Strophitus undulates, Pyganodon cataracta)

• Mallard duck, Anas platyrynchos• Fish

– Fathead minnow, Pimephales promelas– Sunfish, Lepomis macrochirus– Brown trout, Salmo trutta– Chinook salmon, Oncorhynchus tshawytscha

Davis Dam Treatments - 2011

• EPA authorized (2010) Reclamation a Quarantine Exemption per FIFRA Section 18 for Colorado River dams

• Reclamation in process of following NEPA protocols

• Reclamation plans to treat one Davis Dam cooling water system with ZequanoxTM in March 2011

Davis Dam

Key points in EPA letter granting Quarantine Exemption per FIFRA Section 18 to Reclamation:

“An exemption from tolerance will be established for this strain of Pseudomonas flourescens.”

“The proposed use is not expected to pose a significant risk to the environment, to ground water and surface water, or to non-target organisms.”

Questions?

Contact:FNibling@usbr.govLWillett@usbr.gov